What is this?

Ok, I have a few pictures to show you. I will tell you this about it. The pictures are of the skin of a 4 year old Golden Retriever. He has a brain condition which required him to be put on long term phenobarbital and prednisone. The neurologic issues resolved with medication. Approximately 6 months after the medication was started, this happened:

The lesions are hard and crusted. The hair that is attached easily pulls off. There is some itching/discomfort associated with it but overall the dog is doing well - happy, eating, etc.

This WAS biopsied and so we do have a definite diagnoses.

Any thoughts or further questions?